Mold



UNITED STATES PATENT OFFICE.

HOUSE ELECTRIC & MANUFACTURING COMPANY,

vANIa.

A CORPORATION 0F PENNSYL- MOLD.

Specication of Letters Patent.

Original application filed April 4, 1919, Serial No. 287,580. Divided and this application led September 3, 1919. serial No. 321,496.

To all whom t may concern.'

Be it known that I, WILLARD H. KEMrToN, a citizen of the United States, and a resident of Wilkinsburg in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Molds, of which the following is a specification, this being a division of application, Serial No. 287 ,580, filed April 4, 1919.

My invention relates to molds, and it has for itsprimary object, the provision of molds which-are particularly adapted for molding composite articles in such manner as to insure the proper disposition of the employed material in the articles.

It is desirable that some articles such, for example, as machine elements, have selflubricating qualities and, at the same time. be non-conductors of electricity. In such instances, the utilization of graphite, in any considerable quantity, as a lubricant, is prohibited for distribution throughout the entire structure of the article, forfthe reason that the graphite, being a good conductor, permits of the passage of current through the article. Because of this, it is often desirable to construct the articles by employing a plurality of moldable compositions, one of which contains graphite, as a lubricant, and the other of which is non-conducting, the compositions being 4so positioned, relative to each other, that the desired properties, both of insulation and lubrication are attained. V A

Another object of my invention, therefore, resides in the construction of -molds which are particularly adapted for molding articles of the above described character.

With these and other objects in view, my invention will be more fully described, illustrated in the drawings, in the several views of which corresponding numerals indicate like parts,.and then particularly pointed out in the appended claims.

IIn the drawings, Figure 1 is a vertical section of a mold embodying my invention and showing the initial step in molding a composite article, such as a pulleyor roller; Fi 2 is a sectional view, similar'to ig. 1, in which the two materials employed in molding a composite article are shown positioned in the mold previous to the application of pressure to complete the compacting of the "materials, Fig. 3 is a sectional view, similar to Fig. 2, showing thepressure members in their final positions; Fig. 4 is a sectional view, similar to Fig. 3, illustrating a modification of my invention; Fig. 5 is a sectional view of a mold which may be employed inV constructing articles having a different disposition of materials therein; Fig. 6 is a sectional view, showing another slightly modified mold by which cams and articles of similar nature may be formed in accordance with my invention, and Fig. 7 is a sectional view of a member employed in place of one of the members shown in Fig. 6, during one step of my method.

In practising my invention, I may employ a mold in which a moldable material having great mechanical strength, as well as insulating properties, may be positioned and slightly compressed about a spacing meinber, which may be removed after the material about it has been slightly compressed. The subsequent removal of the spacing member provides an opening in which another material, having a lubricant uniformly distributed in it, may be placed, after which, pressure members, adapted to engage the two materials thus disposed in the mold, may be placed thereon and pressure exerted to compact both the materials into a hard unitary article. Heat may be applied throughout the entire molding process or after the materials have been compressed, as seems most desirable.` The positioning and treatment of the materials placed in the mold will be more fully described in the following paragraphs.

In Fig. 1 is shown a mold body 1, having a chamber 2 opening through its ends, and closed at one end by a removable bottom 3 having an opening 4 in which one end of a centering pin or rod 5 may be placed. If the composite article, to be molded in accordance with my invention, is in the nature of a pulley or roller requiring a cylindrical axial opening,'the bottom 3 will be provided with a central opening 4 lin which one end of the rod 5 may be placed, thus disposing the rod axially in, the chamber 2. A spiacing member or sleeve 6, having an opening 7' to receive the rod 5, may then be slipped Patented sept. i4, 1920.

over the rod 5, and a moldable material 8 may be placed around the spacing member 6 to rest upon the bottom 3 and to fill the spacey between the mold body 1 and sleeve 6 to the desired depth. A pressure ring 9 may then be placed between the spacing member 6 and the inner wall of the mold 1, and pressure may be applied to this ring to compress the material sufficiently to so compact it, as shown in Fig. 1, that, when the spacing member 6 is removed, the material will retain its position and form. KJ

Another moldable material 10, lcontaining a lubricant, such as graphite, may now be placed in the space provided by removing the spacing-member 6, and a pressure member or ring 11, similar to the pressure member 9, may be Iplaced about the rod 5 to engage the material last added and, with the member- 9 and rod 5, completely close the top of the chamber 2, whereby pressure may be ap lied to the entire surface of the material disposed in the mold. Pressure may then be applied uniformly to the pressure members 9 and 11, while themold is heated, thus compressing the two materials in the mold to`,form a solid unitary body.

In molding articles of the above described character, the material 8, which is irst positioned in the mold and subjected to sli ht compression, may be a shredded materia a fabric, a loose fibrous material. such as cotton batting, or a granular or finely divided material, such as wood our, the material, whatever it ma be, being impregnated with a suitable bin er such, for exam le, as a phenolic condensation product. W en loose material is employed, an initial pressure, transmitted by the pressure member 9, is essential to so compact the material 8 that it shall retain its position and sha e when the spacing member 6 is removed. he material 10, which 'is employed to partially fill the space provided by the removal of the spacing member 6, may be the'same as the material 8,y with a lubricant, such as graphite, distributed through it.

The mold shown in Fig. 4 may be employed to constructgan article composed of material of a different character from that of the material above mentioned. The material 12 may be a fibrous sheet material, such as paper, duck or muslin, impregnated with a inder containin a lubricant. The material 12 may be woun to form a tube of such proportions that, when-placed in the mold 1, it will engage the wall of the mold and remain in spaced relation to the centering rod 5. On account of the ability of the material 12, which is first placed in the mold 1, to maintain its position and shape, the mold 1 dit'ers from the molds shown in Figs. 1 to 3, inelusive, in that no spacer member is needed,

and the pressure member 13 replaces both pressure members 9 and 11. The material 8,

`chine elements, such as which may be utilized to fill the space between the rod 5 and the material 12, may be a loose fibrous material or a sheet material, impregnated with a suitable binder, such as a phenolic condensation product. material 8 is a sheet material, it ma be wound to form a tube of proper dimensions. The pressure member 13, havin a central opening 7, may be slipped over t e rod 5 to engage the materials disposed in the mold 1 75 and pressure be applied thereto, while the mold is heated, to compact the materials into a hard and unitary bod The mold shown in ig. 5 corresponds, in

detail, to the mold illustrated in Fig. 4., this 80 view being employed in order to illustrate another disposition of materials in the mold. In this case, the material 12 may be woundabout the centering rod 5 to a suitable thickness and be soplaced in the mold that a space shall be reserved between the material 12 and the wall of the mold 1, which may be filled by the material 8. The pressure member 13 may then be placed upon the materials in the mold 1, and pressure and heat may be applied to compact the materials into a hard and unitary body.

Fig. 6 ilustrates one type of mold, embodying my invention, which may be employed in constructing cams and articles of a member 9. The spacing mem er 14: may then be removed and the material 8 disposed in the space provided thereby. The pressure member 15, which corresponds, in shape, to the spacing member 14 but is of less length, may be so positioned about the centering rod 5l that, in conjunction with the pressure member 9, pressure may be applied to compact the materials in the mold, heat being applied either during or after this compression.

It is obvious that, although the molds described and illustrated in the drawings -are cylindrical, various shapes may be em lo ed, especially in the construction of self-lu ricating gears or cams which must have irregular surfaces.

Although I have specifically described several molds and `modifications thereof, which are adapted for molding composite articles, such as pulleys and cams, it is obvious that 'minor changes may be made in their construction to permit of molding of other magears, without departing from the spirit o my lnvention and If the 7`0 I desire, therefore, that no limitations shall be imposed except such as are indicated in the appended claims.

I claim as my invention l. A mold comprising a body portion having a chamber, meansfor compressing a substantially annular body therein, means for reserving a space in the chamber, and means for compressing a body disposed in the reserved space.

2. A mold comprising a body portion having a substantially annular mold chamber, means for compressing a tubular body therein, means for reserving a space in the mold chamber, and means for compressing a body disposed in the reserved space.

3. A mold comprising a body portion having a substantially annular mold chamber, means for compressing a tubular body therein, means .for reserving a substantially annular space in the mold chamber, and means for compressing a body disposed inthe reserved space.

opening, a removable spacing member having an opening to receive the rod, a pressure member corresponding to the spacing member but of less length, and a second pressure member adapted to lill the space in the mold chamber between the spacin member or the rst pressure member andt e inner surface of the Wall of the mold.

5. A mold comprising a body portion having a chamber, a removable-member closing one end of. the chamber and provided with an opening, a rod adapted to seat in the opening, and means fitting in the chamber and about the rod for compressing material placed in the chamber, said means comprising separable' sections.

In testimony whereof, I have hereunto subscribed my name this 25th da of Au 1,919.

WILLARD H. EMP ON. 

